例子：

"今天来一对印度夫妇，印度人好会讨价啊，一上来就说.... " 
vs.  
"今天来了一对夫妇，好会讨价啊，一上来就说...."

夫妇的种族对于故事没有什么大影响，但是第一种写法是在self enforce racial stereotype。

Many people frame their story by race where race was irrelevant.  The reason for these stories to mention race is because the story fits the speaker's racial stereotype. 

Therefore by mentioning race because the story fits the racial stereotype, such style of writing would self-enforce racial stereotype.